在循环内定义的Java变量似乎无法在循环外识别? [英] Java variable defined inside a loop doesn't seem to be recognized outside the loop?

问题描述

我有一段令人困惑的代码.我在if/else语句中定义了一个整数数组，因为该数组的长度取决于该方法的2个输入的长度.我的问题是，在if/else语句之外，变量定义似乎丢失了.

I have a section of code that is puzzling me. I define an integer array inside an if/else statement because the length of the array depends on the length of 2 inputs to the method. My problem is that outside the if/else statement, the variable definition seems to be lost.

import java.util.Arrays;

public class test {

  public String AddArrays(int [] arg1, int [] arg2) {
    int L1 = arg1.length;
    int L2 = arg2.length;
    if (L1 > L2) {
        int[] output = new int[L2];
        for (int i = 0; i < L2; i++) {
            output[i] = arg1[i] + arg2[i];
        }
    } else {
        int[] output = new int[L1];
        for (int i = 0; i < L2; i++) {
            output[i] = arg1[i] + arg1[i];
        }
    }
    String result = Arrays.toString(output);
    return result;
    }
}

我得到的错误是在语句String result = Arrays.toString(output);上，Eclipse告诉我output无法解析为变量.

The error I get is on the statement String result = Arrays.toString(output); where Eclipse tells me that output cannot be resolved to a variable.

...并且顺便说一句，是的，我知道这不是添加两个整数数组的方法-我从更复杂的代码中简化了此过程以演示问题！

...and by the way, yes, I know that this is not the way to add two integer arrays -- I reduced this from more complex code to demonstrate the problem!

推荐答案

在if语句之前定义output.像这样:

Define output before if statement. Like this:

int[] output;
int L1 = arg1.length;
int L2 = arg2.length;
if (L1 > L2) {
    output = new int[L2];
    for (int i = 0; i < L2; i++) {
        output[i] = arg1[i] + arg2[i];
    }
} else {
    output = new int[L1];
    for (int i = 0; i < L2; i++) {
        output[i] = arg1[i] + arg1[i];
    }
}
String result = Arrays.toString(output);
return result;
}

在if语句中声明output时，它仅具有该块作用域.

When you declared output inside the if statement it simply had only that block scope.

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